Basis of Presentation of Unaudited Interim Condensed Consolidated Financial Statements and Significant Accounting Policies - Additional Information (Details)	6 Months Ended
	Mar. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Period of amortization	3 years
Minimum | Subscription Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of contract	1 year
Maximum | Subscription Revenue
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Length of contract	5 years